Plus, concern that software companies will leave the UK due to government backdoors.

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UK ISPs have warned MPs that the costs of implementing the Investigatory Powers Bill (aka the Snooper's Charter) will be much greater than the £175 million the UK government has allotted for the task, and that broadband bills will need to rise as a result. Representatives from ISPs and software companies told the House of Commons Science and Technology Committee that the legislation greatly underestimates the "sheer quantity" of data generated by Internet users these days. They also pointed out that distinguishing content from metadata is a far harder task than the government seems to assume.

Matthew Hare, the chief executive of ISP Gigaclear, said with "a typical 1 gigabit connection to someone's home, over 50 terabytes of data per year [are] passing over it. If you say that a proportion of that is going to be the communications data—the record of who you communicate with, when you communicate or what you communicate—there would be the most massive and enormous amount of data that in future an access provider would be expected to keep. The indiscriminate collection of mass data across effectively every user of the Internet in this country is going to have a massive cost."

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Moreover, the larger the cache of stored data, the more worthwhile it will be for criminals and state-backed actors to gain access and download that highly-revealing personal information for fraud and blackmail. John Shaw, the vice president of product management at British security firm Sophos, told the MPs: "There would be a huge amount of very sensitive personal data that could be used by bad guys. The TalkTalk example is an unfortunate recent one that demonstrates that it is very hard for companies to protect everywhere the kind of data they keep about people, and this would be a requirement to keep a huge amount of further data."

The ISPs also challenged the government's breezy assumption that separating the data from the (equally revealing) metadata would be simple, not least because an Internet connection is typically being used for multiple services simultaneously, with data packets mixed together in a completely contingent way.

Hare described a typical usage scenario for a teenager on their computer at home, where they are playing a game communicating with their friends using Steam; they are broadcasting the game using Twitch; and they may also be making a voice call at the same time too. "All those applications are running simultaneously," Hare said. "They are different applications using different servers with different services and different protocols. They are all running concurrently on that one machine."

Even accessing a Web page is much more complicated than the government seems to believe, Hare pointed out. "As a webpage is loading, you will see that that webpage is made up of tens, or many tens, of individual sessions that have been created across the Internet just to load a single webpage. Bluntly, if you want to find out what someone is doing you need to be tracking all of that data all the time."

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Hare raised another major issue. "If I was a software business ... I would be very worried that my customers would not buy my software any more if it had anything to do with security at all. I would be worried that a backdoor was built into the software by the [Investigatory Powers] Bill that would allow the UK government to find out what information was on that system at any point they wanted in the future."

As Ars reported last week, the ability to demand that backdoors are added to systems, and a legal requirement not to reveal that fact under any circumstances, are two of the most contentious aspects of the new Investigatory Powers Bill.

The latest comments from industry experts add to concerns that the latest version of the Snooper's Charter would inflict great harm on civil liberties in the UK, and also make security research well-nigh impossible here. To those fears can now be added undermining the UK software industry, as well as forcing the UK public to pay for the privilege of having their ISP carry out suspicionless surveillance.